Identification, generation of autoclaved aerated concrete pore structure and simulation of its influence on thermal conductivity

Chen, Gonglian; Li, Fenglan; Geng, Jingya; Jing, Pengfei; Si, Zhengkai

doi:10.1016/j.conbuildmat.2021.123572

Cited by 34 publications

(10 citation statements)

References 9 publications

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“…Other thermal insulating materials including the organic (e.g., PU and PMMA) and inorganic (e.g., SiO 2 -based) aerogels or foams are also shown for comparison. For the aerogels with a similar porosity of around 60%, values for the thermal conductivity are 0.08–0.12 W/mK. ,,,,,− For the cowhide, the thermal conductivity is 0.07 W/mK at 52% porosity, which is also shown inside the drawn ellipse.…”

Section: Results and Discussionmentioning

confidence: 88%

“…The effective thermal conductivity could be calculated by the Fourier law according to the simulation results. , The thermal conductivities of models A, B, and C are 0.075, 0.080, and 0.082 W/mK, respectively. Figure b shows the overall heat flow distribution for models A, B, and C. Figure c highlights the heat flux distribution in the cortex, subfiber, and matrix.…”

Section: Results and Discussionmentioning

confidence: 99%

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A Biomimetic Textile with Self-Assembled Hierarchical Porous Fibers for Thermal Insulation

Zhao

Fang

2022

ACS Appl. Mater. Interfaces

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Natural biomaterials with a porous structure inspired smart textiles for personal thermal management. Inspired by the hierarchically fibrous structure of hides, self-assembled hierarchical fibers with cross-scale porous networks are fabricated by the facile wet-spinning method. The biomimetic textile (abbreviated as "T") woven by such fibers exhibits a low thermal conductivity (0.07 W/mK) comparable to that of cowhide. It also shows a high mechanical strength of up to 10 MPa as well as good flexibility (fracture strain exceeds 300%) and hydrophobicity. The heat conduction mechanism of the hierarchical structure is analyzed via finite element simulation. When immersed with the phase-change material, the textile (named as "P") works like an adipose layer. Integration of the layers of T and P effectively slows down the heat conduction and decreases the surface temperature, resembling an animal insulation system. The study paves the way to mass production of high-performance biomimetic materials with hierarchical cellular microstructures for application in thermal insulation.

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Section: Results and Discussionmentioning

confidence: 88%

Section: Results and Discussionmentioning

confidence: 99%

A Biomimetic Textile with Self-Assembled Hierarchical Porous Fibers for Thermal Insulation

Zhao

Fang

2022

ACS Appl. Mater. Interfaces

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“…In terms of cost characteristics, non-autoclaved cellular concretes significantly outperform autoclaved competitors due to the significantly reduced cost of production and manufacture of such concretes and less environmental impact. From the point of view of technological and recipe factors, there are quite a lot of studies of non-autoclaved and autoclaved aerated concrete [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 ]. However, from the point of view of fundamental science, some gaps should be filled with additional research in the phenomenon of outgassing during the formation of the structure of non-autoclaved aerated concrete.…”

Section: Introductionmentioning

confidence: 99%

“…In other studies [ 17 , 18 , 19 , 20 , 21 , 22 , 23 ], the authors investigated the thermal conductivity of cellular concrete and various factors affecting it. For example, in [ 18 ], the authors developed a model for predicting the thermal conductivity of non-autoclaved cellular concrete using the linearization approach.…”

Section: Introductionmentioning

confidence: 99%

Mathematical Modeling and Experimental Substantiation of the Gas Release Process in the Production of Non-Autoclaved Aerated Concrete

et al. 2022

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The widespread use of aerated concrete in construction has led to the emergence of many types and compositions. However, additional research should fill theoretical gaps in the phenomenon of gas release during the formation of the structure of aerated concrete. Based on theoretical analysis and experimental studies, the article proposes a mathematical model of the swelling process based on the physicochemical laws of convection and molecular diffusion of hydrogen from a mixture and the conditions of swelling, precipitation, and stabilization of the mixture. An improved method for the manufacture of aerated concrete is proposed, which consists of introducing cement pre-hydrated for 20–30 min into the composition of the aerated concrete mixture and providing improved gas-holding capacity and increased swelling of the mixture, reducing the average density of aerated concrete up to 29% and improving heat-shielding properties up to 31%. At the same time, the small dynamics of a decrease in the strength properties of aerated concrete were observed, which is confirmed by an increased structural quality factor (CSQ) of up to 13%. As a result, aerated concrete has been obtained that meets the requirements of environmental friendliness and has improved mechanical and physical characteristics. Economic efficiency is to reduce the cost of production of aerated concrete and construction in general by about 15%.

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“…Foaming is a common method of forming pores and is implemented in the technology of cellular concrete [1][2][3], porous granular and composite materials [4]. Foaming occurs by saturation of the viscous-plastic raw material mass with the gas phase, which forms spherical pores [5]. The nature of porosity depends on the composition and condition of the raw material [6].…”

Section: Introductionmentioning

confidence: 99%

Foam Glass Crystalline Granular Material from a Polymineral Raw Mix

2021

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The article is devoted to the development of resource-saving technology of porous granular materials for energy-efficient construction. The relevance of the work for international research is to emphasize expanding the raw material base of porous lightweight concrete aggregates at the expense of technogenic and substandard materials. The work aims to study the processes of porization of glass crystalline granules from polymineral raw materials mixtures. The novelty of the work lies in the establishment of regularities of thermal foaming of glass crystalline granules when using waste of magnetic separation of skarn-magnetite (WMS) ores and lignite clay. Studies of liquid glass mixtures with various mineral fillers revealed the possibility of the formation of a porous structure with the participation of opoka, WMS and lignite clay. This is due to the presence in the materials of substances that exhibit thermal activity with the release of a gas phase. The foaming efficiency of the investigated materials increases when combined with glass breakage. The addition of WMS and lignite clay to the glass mixture increases the pore size in comparison with foam glass. The influence of the composition of raw mixtures on the molding and stability of granules is determined. The addition of sodium carbonate helps to strengthen the raw granules and reduce the softening temperature of the mass. The composition of the molding mixture of glass breakage, liquid glass and a multicomponent additive is developed, which provides an improvement in the molding properties of the glass mass, foaming of granules at a temperature of 750 °C. Foam glass crystalline granules have polymodal porosity, characterized by a density of 330–350 kg/m3, a compressive strength of 3.2–3.7 MPa, and a thermal conductivity of 0.057–0.061 W/(m·°C). Accordingly, the developed granules have a high potential use in structural and heat-insulating concretes.

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Identification, generation of autoclaved aerated concrete pore structure and simulation of its influence on thermal conductivity

Cited by 34 publications

References 9 publications

A Biomimetic Textile with Self-Assembled Hierarchical Porous Fibers for Thermal Insulation

A Biomimetic Textile with Self-Assembled Hierarchical Porous Fibers for Thermal Insulation

Mathematical Modeling and Experimental Substantiation of the Gas Release Process in the Production of Non-Autoclaved Aerated Concrete

Foam Glass Crystalline Granular Material from a Polymineral Raw Mix

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